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WESTLOCK Interlocking is a Solid State Interlocking (SSI) product by Westinghouse Rail Systems. Westlock builds on many of the features that made SSI popular in the United Kingdom. This includes re-use of SSI's programming language and its external hardware. In addition to backwards compatibility with SSI, Westlock provides additional capacity. This is currently estimated to be around four times that of an SSI, giving it the capability to control over 300 Signalling Equivalent Units (SEUs). Leamington Spa was the test site for Westlock, and was its first operational site. It was also SSI's test site more than 20 years earlier. == Hardware == A Westlock system is divided into a number of components, called the Central Interlocking Processor (CIP), Trackside Interface (TIF) and Technicians Workstation (TW). The hardware used by the TIF and CIP is similar, based around a 2-out-of-3 architecture, whereby all safety-critical functions are performed in three separate processing lanes and the results voted upon. This provides some fault tolerance whereby a single module can fail and the system can continue operating in 2-out-of-2 mode. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Westlock Interlocking」の詳細全文を読む スポンサード リンク
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